Blame him for what? The question is ambiguous.
Obama hasn't done crap to help the economy. it's Bush's fault
Obama hasn't brought all the troops home from Iraq. it's Bush's fault
Obama hasn't closed GITMO. it's Bush's fault
every criticism of Obama is met by squeals of "it's not his fault, he inherited that problem from Bush"
Who passed the budget legislation that Bush (to his discredit) signed in 2007? 2008? Who passed the spending legislation that Obama (to his discredit) signed in 2009? 2010?
Everyone in DC has **** on them.
"It ain't what they call you, it's what you answer to." - W. C. Fields